"Fentanyl containing substance" means one (1) or more of the following substances, including their isomers, esters, ethers, salts, and salts of isomers, esters, and ethers:

1. (1) 4-fluoroisobutyryl fentanyl.
2. (2) Acetyl fentanyl (Other names include: N-(1-phenethylpiperidin-4-yl)- N- phenylacetamide).
3. (3) Cyclopentyl fentanyl. Other name: N-(1-phenethylpiperidin- 4-yl)-N- phenylcyclopentanecarboxamide.
4. (4) Fentanyl related substances.
5. (5) Furanyl fentanyl.
6. (6) Isobutyryl fentanyl. Other name: N-(1-phenethylpiperidin- 4-yl)-N- phenylisobutyramide.
7. (7) Methoxyacetyl fentanyl. Other name: 2-methoxy-N-(1-phenethylpiperidin-4-yl)-N-phenylacetamide.
8. (8) 3-Methylfentanyl [N-[3-methyl-1-(2-phenylethyl)-4- piperidyl] - N-phenyl-propanimide] (9813).
9. (9) 3-Methylthiofentanyl (N-[(3-methyl-1-(2-thienyl)ethyl-4- piperidinyl]-N-phenylpropanamide) (9833).
10. (10) N-(4-chlorophenyl)- N-(1-phenethylpiperidin-4-yl) isobutyramide (para-chloroisobutyryl fentanyl).
11. (11) N-(2-fluorophenyl)-2-methoxy- N-(1-phenethylpiperidin-4-yl) acetamide (ocfentanil).
12. (12) N-(4-fluorophenyl)-N-(1-phenethylpiperidin-4 -yl) butyramide (para-fluorobutyryl fentanyl).
13. (13) N-(1-phenethylpiperidin-4-yl)-N-phenylbutyramide, also known as N-(1-phenethylpiperidin-4-yl)-N-phenylbutanamide, (butyryl fentanyl).
14. (14) N-(1-phenethylpiperidin-4-yl)-N-phenylpentanamide (valeryl fentanyl).
15. (15) N-(4-methoxyphenyl)-N-(1-phenethylpiperidin -4-yl) butyramide (para-methoxybutyryl fentanyl).
16. (16) N-[1-(2-thienyl)methyl-4-piperidyl]- N-phenylpropanamide (thenylfentanyl), including any isomers, salts, or salts of isomers (9834).
17. (17) N-(1-phenethylpiperidin-4-yl)-N-phenylisobutyramide (isobutyryl fentanyl).
18. (18) N-(1-phenethylpiperidin-4-yl)- Nphenylcyclopentanecarboxamide (cyclopentyl fentanyl).
19. (19) Para-chloroisobutyryl fentanyl. Other name: N-(4-chlorophenyl)- N-(1-phenethylpiperidin- 4-yl) isobutyramide.
20. (20) Para-fluorobutyryl fentanyl. Other name: N-(4- fluorophenyl)-N- (1-phenethylpiperidin- 4-yl)butyramide.
21. (21) Para-fluorofentanyl (N-(4-fluorophenyl)-N-[1- (2-phenethyl)- 4-piperidinyl] propanamide (9812).
22. (22) Para-methoxybutyryl fentanyl. Other name: N-(4- methoxyphenyl)-N- (1-phenethylpiperidin-4-yl)butyramide.
23. (23) Tetrahydrofuranyl fentanyl. Other name: N-(1-phenethylpiperidin-4-yl)-N-phenyltetrahydrofuran-2-carb oxamide.
24. (24) Thiofentanyl (N-phenyl-N-[ 1-(2-thienyl)ethyl-4- piperidinyl] -propanamide) (9835).
25. (25) Valeryl fentanyl. Other name: N-(1-phenethylpiperidin-4-yl)-N-phenylpentanamide.
26. (26) Fentanyl.
27. (27) An immediate precursor to fentanyl: 4-Anilino- N-Phenethyl-4-Piperidine (ANPP).
28. (28) Carfentanil.

As added by P.L.48-2023, SEC.3.